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- based on 36000 Super GM draw games-average 2600 ELO- book depth up to 40 halfmoves(Moves: 862.609)- haned tuned and carefully optimised the strongest lines- learning function is protected- no game fragments- no analysis lines- no blitz games- no games up to 20 moves- no annotations- no computer games- no draw book openings

Opening Variety BookA Learning purpose opening book for Arena 2.0 GUI Developed by ChessKnight.3,020,202 moves60 ply- It from the abstract of 1,00,000+ good games bearing ELO: 2400+- It contains 3,020,202 moves and all most all major tournament opening maximum upto 60 ply.- This is a broad comprehensive opening book designed to reflect current chess modern opening theory.- Purpose of book is to learn various opening for humans. This book is NOT meant or optimized for engine-to-engine tournaments eventhough it gives

good results.

USAGE:

- Quit (exit) GUI.- Copy OpeningVariety.abk in the directory of Arena Book .- Restart GUI.- From "Book->manage" menu, Select OpeningVariety.abks and load this book with chess engine of your choice.- You may select to play white to see variations, or you may play white as well.- A greater variety of play can be introduced by various combinations in percentage slid bars by tweaking default settings and varying probability figure.

- eng. vs. eng. games on my Dual systems with ponder=on from the latest four years.- CC-Computer chess database (from CC-Calendar, games 1992 up to today).- the GM database by Olivier DEVILLE.- few special games I collect in the latest years.- few "killer opening variants" I collect in the latest years.- the database have 26.958 games, each game with more than 20 moves- no comments, ELO and other information in PGN file.- hand tuned.- new in version 3.0: I added around 30.000 selected games, each game with more than 20 moves (drawn games 25 up to 99 moves, 1:0 / 0:1 games 30 up to 99 moves)